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A ⇒ P × ( 1 +  \frac{r}{n} )  ^{nt}

Where A = Amount Accumulated ,
P = Principle ,
r = rate of interest ,
n = compounding per period ,
t = no. of periods. 
If you want to calculate compound interest(CI) for Principal=P, at the rate =R %, for a time period = t, compounded n times a year(compounded annually means n=1);
The total amount(A) will be

A=P(1+ \frac{r}{100n})^{nt}

CI= A-P=P(1+ \frac{r}{100n})^{nt} - P=P[(1+ \frac{r}{100n})^{nt}-1]
1 1 1